You actually have a couple of options here. You can call 1-800-4MY-XBOX and verify your account with them, and they can actually help you get set up with a new console passcode for your parental controls. Otherwise, you'll have to wait until your Windows Live ID refelcts that you are the legal age of adulthood, from which point you can go to account management on your console, and promote your account to an adult account.

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